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9mobile Free Browsing For 2018 Using Anonytun Vpn

Sat Feb 17, 2018 9:35 pm by emmy

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How To Check Your Phone Number On Mtn, Glo, Airtel and 9mobile

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2018/2019 Waec Gce Chemistry Practical Answers | Exam Runs Jan/Feb

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Emmi
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PostEmmi on Wed Jan 31, 2018 5:20 am


Chemistry practical Answers 

(1ai)
Burrette readings/cm3:|titre 1|titre2|titre3
Final readings        |33.20  |49.60 |1.50
Initial readings      |16.40  |16.40 |16.65

(1aii)
Average volume of acid used
= 16.40+16.40+16.65(cm3)/3
=49.45cm3/3
=16.48cm3

(1b)
(I) Concentration of Y(OH)2.XH2O in mol/dm3
Using CAVA/CBVB = a/b
CA= 0.025mol/0.25dm3 = 0.1mol
VA = 16.48cm3
CB = ?
VB = 25.00cm3
a = 1mol
b = 2 moles
.:. CAVA/CBVB =a/b
CB = CAVA*B/VB*a
= 0.1 mol/dm3 * 16.48cm3 * 2 moles / 25.00 * 1 mol
CB = 3.296/25
CB = 0.131mol/dm3

3a)
I)Desiccator- usefor preserving moisture sensitive items
ii)Volumetric flasks are used for precise dilutions and preparation of standard solutions.
iii)Glass rod are used to mix chemicals and liquids for laboratory purposes .

3ii)
i)Amphoteric is Al2O3
ii)Neutral oxide is H2O
3iii)
Crystallization

3b.
1. hno3aq to cuco3 solid. a light blue solid,
precipitates is formed
 2. acidified kmno4 to c2h4. c2h4 is oxidized to  ethane-1,2-
diol 
3.  iodine solution to a paste of unripe plantain.  a bluish-black color is produced with iodine



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Last edited by Emmi on Thu Feb 01, 2018 4:52 pm; edited 4 times in total
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PostMr1 on Thu Feb 01, 2018 9:13 am

We are waiting for chemistry practical sire

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